Having an 'internal locus of control' is not incompatible with knowing when circumstances are beyond your control.
Aurelius says something like "How ridiculous and how strange to be surprised by anything that happens in life." As in, why would external events matter or be a surprise? Things happen. The only thing you can control is how you react to them and what you choose to do about them. That helps me at least. It's all about process, not outcomes. Outcome is a roll of the die, so all you can do is make sure your internal processes are sound.
As I mentioned in a different comment, there are much better teachings found in wisdom lineages -- and not just ones from Eastern spiritual traditions. There are shamanic initiations one can undertake. There are specific esoteric martial art lineages that instill this as part of the training.